[NUI] Fix TableView TC fail issue

[NUI] Fix TableView TC fail issue

- TCT crash issue, log =>
E/STDERR  (21795): Unhandled exception. System.NullReferenceException: Object reference not set to an instance of an object.
E/STDERR  (21795):    at Tizen.NUI.BaseComponents.View.Dispose(DisposeTypes type) in Tizen.NUI.dll:token 0x6002b7c+0x591
E/STDERR  (21795):    at Tizen.NUI.BaseHandle.Dispose() in Tizen.NUI.dll:token 0x6000e5c+0xc
E/STDERR  (21795):    at Tizen.NUI.DisposeQueue.ProcessDisposablesIncrementally() in Tizen.NUI.dll:token 0x6000238+0x79
E/STDERR  (21795):    at Tizen.NUI.DisposeQueue.ProcessDisposables() in Tizen.NUI.dll:token 0x6000237+0xd5
E/STDERR  (21795): onSigabrt called